| Kefir is a fermented drink traditionally made by fermenting milk with kefir grains, a living community of bacteria and yeasts. The fermentation process gives kefir its distinctive tangy taste and creates a drink containing a variety of microorganisms and fermentation products. Research suggests that kefir can influence the gut microbiome and may support digestive health. |
Kefir may feel like one of the latest foods to take over the health-and-wellness world, but the drink has been around for centuries. It traces its origins to the Caucasus region, where people made traditional kefir by fermenting milk in containers such as animal-skin bags. They passed the microorganisms responsible for fermentation from one batch to another.
Today, you can find it in supermarkets, cafés and kitchens around the world, prompting casual shoppers and enthusiasts alike to take a closer look at this centuries-old drink. But what is the link between kefir and gut health? To understand that, let’s first look at the science behind this fermented drink.
What Is Kefir?
Kefir is a fermented beverage traditionally made from milk and kefir grains. These aren’t grains like rice, wheat or oats. Kefir grains are clusters containing a complex community of bacteria and yeasts held together in a matrix. They act as the starter culture for fermentation.
When you add the grains to milk, the microorganisms get to work. They consume components of the milk, particularly lactose, and produce compounds such as lactic acid, carbon dioxide and other fermentation products. This changes the milk’s taste, texture and composition, producing the tangy, slightly thick drink we know as kefir.
The exact microbial mix can vary depending on the kefir grains, milk, fermentation conditions and production method.
A different variety of this drink is water kefir. It uses water-kefir grains to ferment a sugary liquid rather than milk. This is a different beverage with a different microbial and nutritional profile, so when we talk about the traditional kefir discussed in most gut-health research, we’re generally referring to fermented milk kefir.
What Can Kefir Do for Your Gut?
Your gut microbiome is a complex community of microorganisms that interacts with your digestive system and the rest of your body. Because kefir contains a diverse collection of microorganisms, researchers have been investigating whether consuming it can influence this microbial community.
And there is evidence that it can. A 2026 systematic review of human intervention studies found that kefir consumption was associated with modest and varied changes in gut microbiota composition.
Notably, Bifidobacterium increased in three of the four studies that measured it. Researchers also found kefir-associated microorganisms in stool samples, suggesting that some may pass through the digestive tract and potentially persist for a period of time. The researchers described the changes as modest and heterogeneous, and the evidence for exactly what those changes mean for long-term health is still limited.
A separate review of 28 human clinical studies also concluded that kefir shows potential for gastrointestinal and microbiome health. But differences in the kefir used, dosage, study length and participants make it difficult to draw sweeping conclusions.
There is also some encouraging evidence specifically around digestive symptoms. In a 2026 randomised controlled trial, healthy young adults who consumed 250 ml of lactose-free kefir daily for six weeks experienced a significant reduction in gastrointestinal symptoms compared with their baseline measurements.
So, is kefir good for gut health? The evidence says it is a promising fermented food with the potential to support the gut microbiome and digestive health.
How Kefir Compares with Other Fermented Foods
Kefir isn’t the only fermented food getting attention for its potential role in gut health. Fermentation is an ancient way of transforming food, and different fermented foods can provide different microorganisms, nutrients and fermentation products. While research into individual foods is still evolving, adding a variety of fermented foods to an already varied diet can be one way to bring more diversity to the table.
Different fermented foods contain different ingredients, microorganisms and fermentation products. So instead of asking which one is the best, think about variety.
Kimchi
Kimchi is made by fermenting vegetables, traditionally including cabbage, with ingredients such as chilli, garlic, ginger and other seasonings. That means you’re getting fermentation and vegetables in the same package. It’s also an easy way to add more flavour to otherwise ordinary meals.
Gut Feast Kenya kimchi is naturally fermented with no unnecessary additives or preservatives. It’s crunchy, tangy and pleasantly spicy, the kind of thing that can wake up a simple meal while bringing fermentation to your plate.
Kombucha
Kombucha is a fermented tea made by combining sweetened tea with a symbiotic culture of bacteria and yeasts. It’s a very different experience from kefir: lighter, tangier and typically enjoyed as a drink.
Our version, Dr Kombucha, comes in four natural flavours and is unpasteurised. It’s a great choice if you’d rather sip a fermented beverage than spoon it onto your plate.
Sauerkraut
Sauerkraut is cabbage transformed through fermentation, usually with salt. Fermentation changes the cabbage and creates a food with its own distinctive flavour and microbial profile.
Like kimchi, sauerkraut also has the advantage of starting with a vegetable, giving you another reason to make fermented plant foods part of a varied diet. It’s especially easy to add to meals as a crunchy side or topping, so you don’t need to completely rethink what you eat to make room for it.
Key Takeaways
Kefir is a traditional fermented drink made using milk and kefir grains, which contain a complex community of bacteria and yeasts. Research suggests that kefir can influence the gut microbiota and may support digestive health. Kimchi, kombucha, sauerkraut and other fermented foods offer additional ways to include fermentation in a varied diet.
Giving Fermentation a Place at Your Table
Kefir has been around for centuries, yet it’s only in recent years that scientists have started taking a closer look at what this fermented drink could mean for our gut health.
And kefir is just one of many fermented foods worth exploring. Kimchi, kombucha and sauerkraut each bring something different to the table, so why not give them a try and see which ones you enjoy?
Shop Gut Feast Kenya’s fermented foods online or get in touch with us to find something your taste buds and your gut will enjoy.
FAQs
What is kefir?
Kefir is a fermented drink traditionally made by fermenting milk with kefir grains. The grains contain a community of bacteria and yeasts that ferment components of the milk, producing a tangy beverage containing microorganisms and fermentation products.
Is kefir good for gut health?
Research suggests that kefir can influence the gut microbiome and may support digestive health.
What are kefir grains?
Kefir grains are clusters of bacteria and yeasts held together in a matrix. They are used as the starter culture that ferments milk to produce traditional milk kefir.
Where do kefir grains come from?
When kefir grains are added to milk and allowed to ferment, they can multiply and produce new grains that can be used to start another batch. Traditional kefir grains have been passed from one generation to another for centuries. The exact origins of the first kefir grains are not known, although kefir is traditionally associated with the Caucasus region.
Can I drink kefir every day?
You can include kefir regularly in a balanced diet if you tolerate it well. However, individual tolerance varies, particularly among people who have difficulty digesting dairy. If a particular food consistently causes digestive symptoms, it’s better to discuss this with a healthcare professional than to force yourself to consume it because it is considered “healthy”.
Is kefir better than other fermented foods?
Not necessarily. Kefir, kimchi, kombucha and sauerkraut are different foods with different ingredients, fermentation processes and microbial communities. Rather than looking for one “best” fermented food, including a variety of foods in your diet is a more useful approach.